Working on the backend

[cc65] / src / cc65 / opcodes.h

diff --git a/src/cc65/opcodes.h b/src/cc65/opcodes.h
index 4f1126c73485c3a61daa3411350251c9f76adde2..bc827dd1a9ca4cbf67efe877cc4af9fc6ed155fb 100644 (file)
--- a/src/cc65/opcodes.h
+++ b/src/cc65/opcodes.h
@@ -119,37 +119,41 @@ typedef enum {
     OPC_TXA,
     OPC_TXS,
     OPC_TYA,
-    OPC_COUNT                  /* Number of opcodes available */
+    OPC_COUNT                                  /* Number of opcodes available */
 } opc_t;
 
 /* Addressing modes (bitmapped). */
 typedef enum {
-    AM_IMP     = 0x0001,       /* implicit */
-    AM_ACC     = 0x0002,       /* accumulator */
-    AM_IMM     = 0x0004,       /* immidiate */
-    AM_ZP              = 0x0008,       /* zeropage */
-    AM_ZPX     = 0x0010,       /* zeropage,X */
-    AM_ABS     = 0x0020,       /* absolute */
-    AM_ABSX    = 0x0040,       /* absolute,X */
-    AM_ABSY            = 0x0080,       /* absolute,Y */
-    AM_ZPX_IND = 0x0100,       /* (zeropage,x) */
-    AM_ZP_INDY = 0x0200,       /* (zeropage),y */
-    AM_ZP_IND  = 0x0400,       /* (zeropage) */
-    AM_BRA     = 0x0800        /* branch */
+    AM_IMP             = 0x0001,               /* implicit */
+    AM_ACC             = 0x0002,               /* accumulator */
+    AM_IMM             = 0x0004,               /* immidiate */
+    AM_ZP              = 0x0008,               /* zeropage */
+    AM_ZPX             = 0x0010,               /* zeropage,X */
+    AM_ABS             = 0x0020,               /* absolute */
+    AM_ABSX            = 0x0040,               /* absolute,X */
+    AM_ABSY            = 0x0080,               /* absolute,Y */
+    AM_ZPX_IND         = 0x0100,               /* (zeropage,x) */
+    AM_ZP_INDY         = 0x0200,               /* (zeropage),y */
+    AM_ZP_IND          = 0x0400,               /* (zeropage) */
+    AM_BRA             = 0x0800                /* branch */
 } am_t;
 
 /* Opcode info */
-#define OF_NONE        0x0000U         /* No additional information */
-#define OF_BRA         0x0001U         /* Operation is a jump/branch */
+#define OF_NONE        0x0000U                 /* No additional information */
+#define OF_UBRA        0x0001U                 /* Unconditional branch */
+#define OF_CBRA        0x0002U                 /* Conditional branch */
+#define OF_RET         0x0004U                 /* Return from function */
+#define OF_BRA         (OF_UBRA|OF_CBRA)       /* Operation is a jump/branch */
+#define OF_DEAD        (OF_UBRA|OF_RET)        /* Dead end - no exec behind this point */
 
 /* Opcode description */
 typedef struct {
-    opc_t          OPC;        /* Opcode */
-    char                   Mnemo[4];   /* Mnemonic */
-    unsigned char   Size;              /* Size, 0 means "check addressing mode" */
-    unsigned char   Use;       /* Registers used by this insn */
-    unsigned char   Chg;       /* Registers changed/destroyed by this insn */
-    unsigned char   Info;      /* Additional information */
+    opc_t                  OPC;                /* Opcode */
+    char                   Mnemo[4];           /* Mnemonic */
+    unsigned char   Size;                      /* Size, 0 = check addressing mode */
+    unsigned char   Use;                       /* Registers used by this insn */
+    unsigned char   Chg;                       /* Registers changed by this insn */
+    unsigned char   Info;                      /* Additional information */
 } OPCDesc;
 
 
@@ -171,13 +175,16 @@ unsigned GetInsnSize (opc_t OPC, am_t AM);
 const OPCDesc* GetOPCDesc (opc_t OPC);
 /* Get an opcode description */
 
+unsigned char GetOPCInfo (opc_t OPC);
+/* Get opcode information */
+
 unsigned char GetAMUseInfo (am_t AM);
 /* Get usage info for the given addressing mode (addressing modes that use
  * index registers return REG_r info for these registers).
  */
 
 opc_t GetInverseBranch (opc_t OPC);
-/* Return a brahcn that reverse the condition of the branch given in OPC */
+/* Return a branch that reverse the condition of the branch given in OPC */